AP reboot issue

I have a deployment in Customer site, with 3502i AP and 5508 WLC, we are 3750X series switches for the AP connectivity. My issue is I see the AP's reboot randomly. There are 25 + stores in the building and at times the AP will reboot in the basement, next it might reboot in the 20 floor, next in 5th floor. And that also the AP will reboot many times, I was just looking at the WCS events and could see 1 AP was rebooting . Below is the log from the WCS

But I can see the Speed negiotiation done to 100M, but actually it should be 1000M.

The AP fell back to this state after TDR testing

Gi3/0/44 auto on 15.4 Ieee PD 3 30.0

This AP was not joining the WLC and i had to console, it joined the WLC once when I plugged out the cable and plugged in. But lost the connectivity soon and I had to boot with the rcv image for the AP join the WLC

Leo, thanks for the analysis, i m in a really bad state, this issue is happening for me through out the network. I have 140+ AP in my network and it s randomly happening..I have raised a TAC, let me see, how the TAC will resolve the issue. But it s Jordan TAC, so I have my fingers crossed

Could Nik be looking at an entire cable plant issue? I'm thinking maybe the building is cabled with pre-Cat5e, pre-1995 "Cat5." Gigabit is intermittent on that old stuff, not to mention PoE in the mix adding EMF.

You can get 1Gb to run on Cat5, but only at shorter distances. Specific distances vary by manufacturer and product because, if I recall, Cat5 wasn't really an industry wide standard. Rather, it was a loose spec that meant a wide range of product quality hitting the market. It wasn't until 1995 and Cat5e that minimum specs for twists/m, frequency and other parameters were standardized.

I could be wrong about the specific history there, but to put it simply, you can't trust 1Gb on Cat5 and you can't trust what exactly "Cat5" means.

Check the jacketing on your cable. Pre-standard wiring will usually have "CAT5," cryptic/unfamiliar printing, or nothing at all stenciled on it.

Pair "A" is "OPEN"??? This pair will determine if your WAP should connect or not.

The cable directly connected to the switch is faulty. Sorry to say this (I'm not being rude or arrogant here), but I don't care if the cable came out from a pack. If your TDR result is saying it's faulty, it's faulty.

You can RMA all the WAP you can lay your hands on, if the cable is faulty ...

TIA Cat6 Perm Link is an adaptor with a PLA002 "tip". IT doesn't measure cable-to-cable. This only measure patch panel-to-patch-panel.

Good enough for me. I'm still wondering as to why your Cisco TDR is coming up with the result.

Hmmmm ... May I request something from the cable testers? Can I request if they test from cable-to-cable test? I want to eliminate the patch cord (switch end) to the WAP end patch cord using the same method.

I do NOT mean they take down both patch cord and test it. I mean leave the patch cords connected to the patch panel and run the test using the DTX-CHA001 module at both ends.

I've just reviewed your cable report. Why did the cablers do that???? Look at the right-hand corner. Look what is heading under the "Main Adapter" and "Remote Adapter". Experience have taught me NEVER to mix the PLA002 with the CHA001. If one was to test using the PLA002 then the remote should also be PLA002. Weird!

Well that is a good report, what I would check next is the patch cables. If you take that ap and connect it directly to the same switchport using the same cat5/6 cable, does the ap negotiate at 1000mbps? I not, swap out the patch and test again. I had an install about half a year ago that tested clean using a fluke. When we started to bring up the AP's, only 5% of the AP's came up. After hours of testing, we swapped out the patch with a different batch of patch cables we bought and presto... Everything came up. So it was a bad batch of cat6 even though for some reason we could also test those clean with a fluke. One trick I do now when I run into situations like this is to have a can of air and blow out any dust from the ap Ethernet port, the jack, patch panel and switchport. The only reason is usually I noticed that hen mounting on the ceiling, the ports usually gets some ceiling tile particles in it before they plug the able into the jack and the ap. On the wiring closet side, not so bad unless they are putting up the ceiling or something at the same time.

The one thing is that many of the cable testing is from patch panel to jack (on the ap side). They only need this to verify their installation for warranty. I don't know any vendors that I have worked with that will test with the patch cable since that might affect their testing and qualifying their installation.